| 摘要 |
PURPOSE:To accurately calibrate a measured dose by correcting a natural exposure dose of an internal calibration glass element by using a natural exposure dose obtained from a natural exposure monitoring element. CONSTITUTION:A reference exposure value D is inputted at the time of an external calibration. After an external calibration glass element 21 is conveyed to a measuring position 23 by a conveyor 22, an ultraviolet ray is excited, and a fluorescence read value C of the element 21 is read by a reader 1. Similarly, fluorescent read values B0, E0 of an internal calibration glass element 25 and a natural exposure monitoring glass element 26 are read. A dose value of the element 25 is decided by using the data. Thereafter, a fluorescence read value A of a dose measuring glass element 27 (fluorescent glass dosimeter) is read, and a true do is obtained. An internal calibration process is executed at each predetermined period. In this case, fluorescence read values Bn, En of the elements 25, 26 are read. Up to following internal calibration, when the read value A of the element 27 is read, a true dose read value is obtained by a formula. Thus, a dose read value of the dosimeter can be calibrated without external calibration for a long period.
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